This is a simple Windows NT Console mode application that can be found
in the SEC driver archive.  It is presented here just to give a feel for
how programs open the driver and issue commands to it.

---- cut here ---
/*
**  clear.c  --  issue an SEC clear command
**  Sample user mode (application space) program to test the device driver.
*/
#include    <windows.h>
#include    <stdio.h>
#include    <winioctl.h>
#include    "../include/secdrv.h"

void main (void)
    {
    HANDLE           hFile ;    // handle to driver device
    SECDRV_IN         args ;    // argument buffer (unused in this case)
    SECDRV_OUT   outBuffer ;    // results buffer
    DWORD    bytesReturned ;    // # of bytes returned in outBuffer

    hFile = CreateFile (SEC_NAME, ETC_O) ;   // Open the Device "file"

    if (hFile != INVALID_HANDLE_VALUE)
        {
        if (DeviceIoControl (hFile,
                (DWORD) SECDRV_CLEAR,       // The clear command
                &args,                      // InBuffer
                SECDRV_INSIZE,              // InBuffer size
                &outBuffer,                 // OutBuffer
                SECDRV_OUTSIZE,             // OutBuffer size
                &bytesReturned,
                NULL))                      // synchronous I/O
            {
            printf ("SEC Driver version %d.%d  Counters cleared.",
                         outBuffer.DriverVersion >> 8,
                         outBuffer.DriverVersion & 0xFF) ;
            }
        else
            {
            printf ("DeviceIoControl error code = %ld\n", GetLastError());
            printf ("Look it up in WINERROR.H\n");
            /*
            ** For instance, if the call supplies a results buffer of the
            ** wrong length, the driver returns STATUS_INVALID_PARAMETER.
            ** Somebody or other translates it to ERROR_INVALID_PARAMETER,
            ** and it prints out as "error code = 87".
            */
            }

        if (!CloseHandle (hFile))
            printf ("Device close failed.\n") ;
        }
    else
        printf ("Device %s could not be opened\n", SEC_NAME) ;
    }

/*
** End of user mode test program
*/